The Associated Press confirms that Mentell, who is originally from Waukegan, Illinois, passed away when his Jeep swerved off a steep embankment and hit two trees at about 8:30 a.m. Mentell was not wearing a seatbelt.

The actor played lawyer Garrett Wells on Boston Legal from 2005 to 2006; more recently, he appeared in the 2009 film G-Force.